
Fisika modern 1
Authored by Abdul Rachman
Physics
12th Grade
Used 19+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Sebuah logam mempunyai frekuensi ambang 4 x 1014 Hz. Jika logam tersebut dijatuhi foton ternyata elektron foton yang dari permukaan logam memiliki energi kinetik maksimum sebesar 19,86 × 10-20 Joule. Hitunglah frekuensi foton tersebut! (h = 6,62 × 10-34 Js)
5 × 1014 Hz
6 × 1014 Hz
7 × 1014 Hz
8 × 1014 Hz
9 × 1014 Hz
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Sebuah benda dengan luas permukaan 100 cm2 bersuhu 727oC. Jika koefisien Stefan-boltzman 5,67 x 10-8 W/mK4 dan emisivitas benda adalah 0,6. Tentukan laju rata – rata energi radiasi benda tersebut!
170,1 J/s
340,2 J/s
640,4 J/s
1280,8 J/s
2561,6 J/s
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Panjang gelombang radiasi maksimum suatu benda pada suhu T Kelvin adalah 6000 A. Jika suhu benda naik hingga menjadi 3/2 T Kelvin. Tentukan panjang gelombang radiasi maksimum benda!
1000 A
2000 A
3000 A
4000 A
5000 A
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Hitunglah energi dari suatu foton cahaya biru dengan panjang gelombang 450 nm
4,42 x 10-19 J
1,42 x 10-19 J
2,42 x 10-19 J
3,42 x 10-19 J
5,42 x 10-19 J
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Untuk memutuskan ikatan kimia di dalam molekul-molekul kulit manusia yang menyebabkan luka terbakar sinar matahari, dibutuhkan sebuah energi foton kira kira 3,50 eV. Berapakah panjang gelombangnya?
354 nm
123 nm
345 nm
456 nm
768 nm
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
1. Energi kinetik foto elektron berkisar dari nol hingga 50 x 10-19 J. bila cahaya dengan panjang gelombang 3000Ǻ jatuh pada sebuah permukaan. Berapakah potensial henti cahaya ini?
3,13 eV
2,12 eV
4,14 eV
5,15 eV
6,16 eV
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Frekuensi ambang suatu logam sebesar 8,0 × 1014 Hz dan logam tersebut disinari dengan cahaya yang memiliki frekuensi 1015 Hz. Jika tetapan Planck 6,6× 10-34 Js, tentukan energi kinetik elekton yang terlepas dari permukaan logam tersebut!
1,32 × 10-19 J
2,32 × 10-19 J
3,32 × 10-19 J
4,32 × 10-19 J
5,32 × 10-19 J
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